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Mastering Python: Annotations, Errors and Environment

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Raising

Let's learn how to raise an error.

Errors can be raised using the raise keyword:


              
1

            
raise TypeError
copy

The TypeError in the example above was raised without a message.

To output an error message, you can pass a string inside the parentheses () after the error object:


              
1

            
raise ValueError("Wrong value!")
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Oppgave

Swipe to start coding

You have implemented the perimeter() function that returns the triangle perimeter. This function receives the sides of a triangle (a, b, and c). You need to add error raising to this function.

  1. All received sides should be int or float data type. In another case, the function should raise the TypeError with the message "All sides should be int or float type".

  2. In a triangle, all sides should have a length greater than 0. In other cases, the function should raise the ValueError with the message "All sides should be greater than 0".

  3. In a triangle, the sum of two sides must always be greater than the third side (otherwise, the two sides would not reach each other through the third side). Therefore, if one of the received sides is greater than the sum of the other two, the program must raise the ValueError with the message "It's not a triangle".

Løsning

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Seksjon 3. Kapittel 3
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Raising

Let's learn how to raise an error.

Errors can be raised using the raise keyword:


              
1

            
raise TypeError
copy

The TypeError in the example above was raised without a message.

To output an error message, you can pass a string inside the parentheses () after the error object:


              
1

            
raise ValueError("Wrong value!")
copy
Oppgave

Swipe to start coding

You have implemented the perimeter() function that returns the triangle perimeter. This function receives the sides of a triangle (a, b, and c). You need to add error raising to this function.

  1. All received sides should be int or float data type. In another case, the function should raise the TypeError with the message "All sides should be int or float type".

  2. In a triangle, all sides should have a length greater than 0. In other cases, the function should raise the ValueError with the message "All sides should be greater than 0".

  3. In a triangle, the sum of two sides must always be greater than the third side (otherwise, the two sides would not reach each other through the third side). Therefore, if one of the received sides is greater than the sum of the other two, the program must raise the ValueError with the message "It's not a triangle".

Løsning

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 3. Kapittel 3
Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Vi beklager at noe gikk galt. Hva skjedde?
some-alt